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Receivables, Net (Tables)
9 Months Ended
Sep. 30, 2021
Receivables, Net  
Schedule of receivables

September 30,

December 31,

($ in millions)

2021

    

2020

Trade accounts receivable

$

1,282

$

825

Unbilled receivables

702

528

Less: Allowance for doubtful accounts

(8)

(9)

Net trade accounts receivable

1,976

1,344

Other receivables

513

394

$

2,489

$

1,738